Net Worth: $1.15 billion
Brazilian-born Saverin cofounded Facebook with Harvard classmate Mark Zuckerberg and for a brief time had a one-third stake. When Zuckerberg quit school to relocate to California, Saverin stayed behind to graduate. A year later Facebook sued him; he countersued. The parties settled with Saverin apparently getting a 5 percent stake and cofounder bio on Facebook's site.